Photoflash synchronizer unit and equipment



May 30, 1944. c3- sTElNER 2,350,258

PHOTOFLASH SYNCHRONIZER UNIT AND EQUIPMENT Filed Aug. 4, 1942l s sheets-shed 1 2e An Ii 25 Y 6..: u A

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May 30, 1944. o. sTElNr-:R 2,350,258

PHOTOFLASH sYNcHRoNIzER UNIT AND EQUIPMENT Filed Aug. 4, 1942 3 Sheets-Sheet- 2 IE` is mw y 56d wh56 O. STEINER May 30, 1944.

PHOTOFLASH SYNCHRONIZER UNIT AND EQUIPMENT Filed Aug. 4, 1942 3 Sheets-Sheet 3 IIIII INVENTOR. aflcare 2^?, @Mnl/(fwd,

zfzer HzsAToRNEYS Patented May 30, l1944 PHOTOFLASH SYNCHBONIZER UNIT AND EQUIPMENT Oscar Steiner, Rochester, N. Y., assigner to The Folmer Grailex Corporation, Rochester, N. Y., a

corporation of Delaware Application August 4, 1942, Serial No. 453,504

8 Claims.

This invention relates to new and improved photographic flash synchronize'rs, particularly adapted for operating with flash bulbs having a short-time-delay fuse.

In order that the principle of the invention may be readily understood, I have disclosed two embodiments thereof in the accompanying drawings, wherein Fig. l is a front elevation of a camera equipped with a magnetic tripper synchronizer and battery case for operating the shutter, a special contacting device for completing the circuit vto the flash lamp being shown mounted on the lens board, and a reflector carrying a special contact device being also shown with a flash bulb in place; l

Fig. 2 is a view in vertical section through the reflector and socket assembly;

Fig. 3 is an enlarged detail in elevation and partially in section, showing the construction of the series contacting device;

Fig. 4 is a partial elevation on an enlarged scale, showing the synchronizing tripper, the photographic shutter, and the contact device, all in their respective positions;

Fig. 5 is a right hand side elevation partly in section on the line 5-5,.Fig. 4;

Fig. Gis a vertical section on an enlarged scale on the line 6 6, Fig. 4;

Fig..7 is a horizontal section on the line l--1, Fig. 4;

Fig. 8 is a fragmentary detail in elevation similar to Fig. 4, but showing the magnetic tripper in its condition at the time of shutter operation;

Fig. 9 is a top plan view of the contacting device With the cover removed to show more clearly the construction thereof Fig. 10 is a modification showing a second type of contacting device that operates on the shutter set lever, the electrical circuit with its battery and the flash lamp also being shown;

Fig. 1l is a view similar to Fig. 4 but showing the contacting device of Fig. 10 operated by the shutter set lever, the cover of the contacting device being also shown, but partially broken away to show more clearly the contacting members and the operating cam; and

Fig. 12 is a left hand elevation of Fig. l1.

The standard ash lamp is equipped with a fuse that causes approximately a millisecond delay from the time of completing an electrical circuit through the .fuse to the peak of the flash. There, has recently been developed a flash lamp known as the S. M. type of lamp manufactured by the General Electric Company having a time delay of 5 milliseconds from the time of completing the electrical circuit until the peak of the flash has been reached. Therefore, all existing synchronizersthat have been designed to operate with a bulb having the longer time delay will not function with the bulbs of the short delay. l

By my present inventionI have provided a readily adjustable synchronizer unit, assembly or attachment that works in conjunction with the regular synchronizer, such as is disclosed in my Patent No. 2,329,011, dated September 7, 1943, so as to cause accurate synchronization between the photographic shutter and the bulb of short duration, without, however, in any way disturbing the regular or basic synchronizer from properly synchronizing a bulb having a longer time delay with the photographic shutter, and Without necessarily making any timing adjustments because of the substitution of the bulb of very short time delay for the bulb of longer time delay.

Among the objects of the present invention are: to provide an attachment to be used with a synchronizer having a 20 millisecond delay that will ilash a lamp having a 5 millisecond delay and in timed relation to the opening of the shutter; to provide a synchronizing equipment for use with a standard battery case and magnetic tripper, for synchronizing the short delay lamps without in any way changing the adjustment of the magnetic tripper and its operation of the shutterl in timed relation with a bulb having a delay of approximately 20 milliseconds; to provide a synchronizing attachment that can readily be applied to the camera lens board and having means for adjusting the contacting attachment with respect to the camera shutter operating lever; to provide a synchronizing attachment for synchronizing lamps of short time delay, and having a detachable reiiector adapted to the said smaller bulbs; to provide means carried by the reflector assembly for completing a circuit through the battery, through the lamp and through the synchronizing contacting device; to provide a synchronizing equipment for flashing lamps of either'short or long delay and in timed relation with the photographic shutter; to provide means for quickly changing a synchronizing equipment intended for operating with a bulb of long delay, to a bulb of short delay or vice versa; to provide a synchronizing equipment having a separate reflector and a socket attached thereto to accommodate the short delay bulb and having a series connecting means carried by said reilector for completing a circuit through the synchronizing contact device and flash bulb; and to provide a synchronizer having a contacting device of very simple construction that is foolproof and will provide a long, useful life, but which is inexpensive to manufacture.

Reference is first made to Figs. 1, 2 and 3 wherein there is indicated at a camera of any usual or desired construction, to which my invention is adapted to be attached and which camera is equipped with the usual lens board 2| having a shutter 22, a shutter set/lever 23 and a shutter release lever 24. f

In' my said Patent 2,329,011 and also in my Patent No. 2,293,477, dated August 18, 1942, I have represented a magnetic tripper, and in Fig, 1 of this application I have represented the same magnetic tripper at 25. A connecting link 26 is provided by which the magnetic tripper armature is connected with the shutter release lever 24. The camera is also equipped with a battery case indicated at 21 and is connected to the camera easing in any suitable way. Such battery case may be of any suitable type or character, but in the present disclosure constituting an example or embodiment of my invention, I have represented the battery case shown in my said Patent's 2,293,477 and 2,329,011. The same is here shown as equipped with a plurality of electrical outlets, one of which is indicated at 28 in Fig. 1, and another of which receives a connecting plug 29 having a wire 3|) made up of two cially adapted to a bulb havingf'a short ignitiony delay, as already explained. I have attached to the said reflector 3| a. bracket 32, shown in Fig. 2, for attaching the said reector to the battery case 21. While I have herein shown such bracket 32 as one specially adapted to the battery case that is disclosed in my said patents, it is to be understood that the bracket may be modified in any suitable way so as to adapt it -to any type of battery case. d

To the said attaching bracket 32 there is fastened a socket 33 by means of a supporting member 34, a screw being employed for this purpose insulated electrical conductors extending to and which, or the equivalent thereof, is present on all battery cases using a magnetic tripper as a part of a photographic flash synchronizer.

Reference is made to Fig'. ,1 of my said Patents 2,293,477 and 2,329,011 as showing the basic features of the photographic flash synchronizer thus far disclosed and to which, ln a manner that will now be described, there is attached or applied the unit, assembly or attachment by which the photographic ash synchronizer shown in my said patents may be employed with a flash bulb having a very short ignition delay, without in any way disturbing the basic features of the synchronizer from properly synchronizing with a bulb having a longer time -delay in the manner described in said patents.

When using a flash bulb having a short ignition delay, as, for example, a. ve-millisecond delay, it is advisable and highly desirable to use a reector specially designed therefor. Such a reilector constitutes a part of the readily `insertable unit, assembly or attachment that I have provided and which I will now proceed to explain, and part of which unit, assembly or attachment is applied directly to the lens board of the camera and is in its entirety operatively connected to existing parts of the already existing photographic flash synchronizer, such as disclosed in my said patents.

In order to provide such a readily insertable unit, assembly or attachment, the parts whereof are shown in Fig. 2 of the drawings hereof, I have provided a reflector 3| (Figs. 1 and 2) espeif desired, as indicated in Fig. 2. The said socket 33 is composed of a tubular member open at one end and having fitted at the opposite end an insulating plug held in place by a screw 36. Thetached to the lamp socket 33 by means of the said screw 36. The said hook member 4| is pro" vided with a handle 42 to swing itin an outward direction when the handle 42 is pressed in a downward direction for disengaging the lampbulb with its lamp base 39 from the said lamp socket 33. In order to prevent the hooked member 4| from moving too far, there is provided a shoulder screw 43. The said short-time delay lamp 40 is provided with the usual 'contact 44 to which one side of the fuse is connected, the other side of the fuse being connected to the lamp base 39. It will be understood that all battery cases are provided with some sort of spring contact for the purpose of making contact with the central contact of the usual large photo-flash lamp (that is, a lamp having a relatively longer time lag or delay than the one with which this invention is more particularly concerned) In Fig. 2 there is shown a partial section of the central contact member as used in the battery case of my said Patent 2,329,011, it being indicated herein at 45 and being designated 19 in Figs. 16 and 18 of my said Patent 2,329,011. The said contact member 45 (or 19 in my said patent) is axially movable, it having a spiral spring thereunder functioning in ejecting a used bulb, such spring being indicated at 45a in Fig. 2 and at |01 in my said patent.

In order to complete the circuit between the contact 44 of the flash bulb 40, shown in Fig. 2 and the contact central member '45, in the use of the unit, assembly or attachment shown in Fig. 2 h'ereof, I have provided a structure shown in Fig. 2 and upon a larger scale in part in Fig. 3, wherein a cylindrical rod is represented at 46, having an enlarged head 41, the said rod 46 being fitted into a sleeve 48 which in turn is fitted into an insulating cup 49 itself fitted into a metallic cup 50. To the said sleeve 48-1isattached a conductor 5I, shown in Figs. 'l2-and 3, and to the metallic cup 50 is attachedl-'a'second conductor 52. Said two conductors 5|f`and 52 are shown complete in Fig. 1. i i

It will be noted that the enlarged head 41 of the rod 46, whichvserves as a contact member for the lamp contact 44, is insulated from the metallic cup 59, the latter serving as a. contact member for establishing contact with the central battery case contact 45 which, as stated.

corresponds to the contact 19.01 my said Patent 2,329,011.

The'rod 46 passes through a hole in the insulating plug 35 in the lamp socket 33, and the sleeve 48 is then attached thereto and is held in place by means of a groove 53 cut or formed in the rod 46. The upperend of the said sleeve 4l is provided with a spun-over end for engaging the said groove 53 and for the purpose of providing a tight contact between the rod 46 and the sleeve 48, the latter is provided with a lengthwise extending slot 54.

The parts shown in Figs. 2 and 3 constitute the unit, assembly or attachment intended for ready insertion in or application to a photo-flash synchronizer having a magnetic tripper of which one example is shown in my said patents and which ,unit, assembly or attachment is used in cooperation with an auxiliary switch that will be described.

When the contact switch on the battery case 21 is closed, a circuit is completed to the magnetic tripper 25 and to the contact 45 of the battery case. Itl will be understood that when using the usual photo-flash bulb (that is, a .photo-flash bulb having a longer time delay) the contact part of that bulb is in contact with the contactr member 45, herein shown at the bottom of Fig. 2, and also in Figs. 16 and 18 of my said Patent 2,329,011, and would be caused to flash. But in accordance with my present invention, I have broken or interrupted the circuit between the said contact member 45 and the said lamp Contact 44, and even though the circuit extends to the contact 45, the circuit does not yet extend to the contact 44, and hence is not completed. Only when the circuit between the wires 5I and 52 is completed will the lamp 40 be ignited, following the fivemillisecond delay, the circuit being completed through an auxiliary switch 55.

Inasmuch as the magnetic tripper constituting a part of the organization shown in my said patents has been constructed and arranged to cause a twenty-millisecond delay between the instant of closing the switch on the battery case and the operation of the shutter, it is necessary, when using the shorter-time-delay lamps, such as in- -dicated at 40, to provide means for prevent-.ing

the current 'at contact 45 from reaching the lamp 40 until approximately fifteen-milliseconds later (in the present example of the first embodimentl of my invention), or, in other words, reaching the contact to the said lamp 40, which, as explained, is in this instance a lamp having a short interval fuse or fuse of approximately flve-milli seconds delay, and it is an important purpose of my invention to provide such means.

It is well known in the art that the average between-the-lens shutter reaches a full open condition five milliseconds after the shutter release 24 has been operated and has reached the end of its travel. Therefore, if the contact to thelamp 40 is closed at the time that the shutter release lever 24freaches the end of its travel, andy inasmuch as the lamp40 has a five-millisecond delay from the timeof contact to the peak of illumination, the

.shutter 22 will be'fully opened at the end of five milliseconds after the shutter release 24 has been operated, and the lamp. will accordingly be at peak illumination five `,milliseconds after such contact has been made, which would provide the proper synchronization. Therefore, y to .cause contact of the lamp 40- to take place at theV end of the kstroke ofthe shutter release lever 24 and to. secure the 4desired synchroniaatlonkwith the use of the type of bulb indicated at 4l, I have provided an auxiliary switch, indicated generally at 55 in Fig. 1 and shown in detail in Figs. 4 to 9. which, as hereinafter explained, is attached to the lens board of the camera.

In Figs. 4 and 5, the magnetic tripper 25 is shown as mounted on or secured to the lens board 2i byemeans of a bracket 56 having clamp screw 56a, and is held to the said lens board by means of screws 51, 51. The said magnetic tripper is fully disclosed in my said patents and need not be here further described. It is to be understood that any other magnetic tripper that will cause the shutter lever 24- to be properly operated will work satisfactorily in the present organization, and my invention is not limited to that shown.

The magnetic tripper 25 is provided (as shown in Figs. 4 and 5) with a lower terminal block 58 having openings 59, 'I9 to which cable 30 is attached by means of plug 30a (Fig. 1) for completing a circuit between the battery case and the magnetic tripper. The latter is provided with an operating rod 60 having a nut 6I for receiving the'operating link 25, which in turn operates the shutter release lever 24. When the circuit is completed through the battery and the magnetic tripper 25, the rod 60 is moved in a downward direction, operating the shutter release lever 24, as indicated in Fig. 8, and thus operating the shutter of the camera, as fully explained in my said patents.

Referring now to the auxiliary switch which is attached in a manner to be described to the lens board 2i, the said switch, indicated at 55, is provided with a bell crank 62 (best shown in Figs. 4 and 8). It is pivoted, as shown in Fig. 6, on a stud 63'and is held thereon by means of a screw 64, as illustrated in Figs. 5 and 8. The said stud 63 is itself attached to a switch plate 65 (shown in Figs. 4, 5 and 6) in any well known manner as by riveting as indicated at 63a in Fig. 6. The said bell crank 62 has a laterally extending arm 66 that is provided with a slot or opening 51, shown in Fig, 7 as receiving the rod 60 of the magnetic tripper 25. The upper end of the bell crank 62 is provided as shown in Figs. 4, 7 and 9 with an Insulated button 68 for operating the switch member 69, shown in Figs. 7 and 9, and the bell crank 62 is prevented from rotating too far in a contraclockwise direction by means of the upturnedarm 10 of the base plate 65.

The switch housing, best shown in Fig. 6, is made up of two symmetrical castings 1i, 12 of any suitable insulating material. The said castings are held to the switch plate by means of a stud 13, nut 14, and washer 15, and are also held in alignment by the stud 63. Placed in grooves orrecesses 16, 11 are contact fingers or members 69, 18 that are of the form or shape tacts 82A and 83 will be closed, thereby Icompleting a circuit to the wiresl 5l, 5.2, and so igniting the flash lamp.

frige vauxiliary switch 5541s secured to' the'iens board 2| of the camera by means of screws 84, 85 that pass through elongated openings l5, 81 respectively (Figs. 4 and 9) of switch base 85 and are threaded into the lens board 2|. The

said auxiliary switch 55 is adjusted in a vertical lout that in ilash lamps of very short dux'ation,` such as five milliseconds, when they are caused to be ignited at the same time the circuit is completed to the magnetic tripper, the flash will take place before the shutter is opened. Therefore, in the construction herein disclosed (referring particularly to Fig. 3 when taken with Figs. 1 and 2 it'is necessary to insulate the lamp 40 with its contact 44 from the battery case contact 45 and 'to provide a delay in the circuit to the said lamp 40. In the disclosed embodiment of the invention shown in Figs. 1 to 9, the delay provided is the time that it actually takes the magnetic tripper to operate the shutter, and since the said lamp 40is controlled by the auxiliary switch 55, which also is controlled by the magnetic tripper 25, when the shutter is being operated, it does not matter what the delay in the action of the magnetic tripper is, as the magnetic tripper, in this embodiment of my invention, operates both the shutter and the auxiliary switch 55, through which the circuit is completed to the lamp 40. It has been pointed out that the delay in the lamp 40 is ve milliseconds, and the delay in the average shutter from the time the shutter release lever thereof is fully operated until the blades of the shutter are fully opened is tive milliseconds. Therefore, in the rst embodiment of my invention the said lamp 40 is synchronized by the auxiliary switch 55.

Inasmuch as herein the auxiliary switch 55 controls the lamp 40, it is necessary to insulate the contact (Fig. 2) of the battery case from the contact 44 of the lamp 40, so that when the battery switch is operated, current will not flow from said contact 45 direct to said contact 4 4', but. there is a circuit established between contact 45 and contact 44 through the auxiliary switch 55 introduced into the circuit for that purpose.

Therefore it is necessary lto insulate the contact cup (Fig. 3) from the sleeve 48 by separating cr breaking the circuit between the wires 5| andy 52. 'Ihe structure shown in Fig. 3 provides ready means .for connecting the wires .5| and 52 into the circuit and in series with the contact 45 and the contact 44, but the same result could be secured by soldering or otherwise fastening the wire 52 to the contact 45 and the wire 5| to the contact 44. Otherwise stated, it is necessary to get a circuit from the contact 45 through thecup 50, wire 52, auxiliary switch 55, wire 5I, sleeve 48, rod 46 and contact 44. Therefore, it is necessary, in the disclosed construction, to insulate the cup 50 from the sleeve 4I,

Vthus insulating it from the rod 46, since otherwise the auxiliary switch 55 would have no function, because the lamp 40 would flash when the battery switch is operated, since when the battery switch is operated, the circuit is completed to the magnetic tripper 25, and hence to contact 45, and if there were no insulation provided at 49 ln Fig. 3, the circuit would flow through the cup 58, sleeve 48, and then to contact 44 of the lamp 48, thereby flashing it. Such flashing, of course, must not happen until the auxiliary switch 55 has been operated, so that said switch 55 will properly time the said lamp 40 with the shutter release lever 24.

It will be understood from the foregoing dey way disturbing the synchronizer structure as already on the market, which may therefore without change be used for properly synchronizing a bulb having a longer time delay with the photographic shutter, precisely as described in my said patents.

It will be evident from the foregoing description thatin applying my present invention to a photographic flash synchronizer such as shown in my said patents, it is not necessary to change the adjustment of the magnetictripper, nor to disturb its operation of the shutter in its timed relation to the bulb having a delay of approximately twenty milliseconds.

It wil1 be seen that I have provided a synchronizer equipment for dashing lamps of either a short delay or a long delay, each in properly timed relation with the photographic shutter,

and I am enabled quickly to change a synchronizer equipment intended for operating with a bulb'of long delay to one for operating with a bulb of short delay and vice versa. This result is desirably secured by providing a unit. assembly or attachment including the short delay bulb, or the socket therefor, with a reectorv particularly suited to such short delay bulb and attaching to the socket of such short-delay bulb suitable cone the time the shutter is released until the blades thereof are fully open. Therefore, the shortest interval that can be synchronized by the use of the first embodiment of my invention just de scribed is an interval equal to the shutter-opening time, which, as already stated, is usually ve milliseconds. However, as the shutter is released,

` the shutter set lever 23 is used as a synchronizing medium or instrumentality, as generically the shutter set lever 23 thereof is, as is well known, caused to travel in a contraclockwise direction, and during such travel, the shutter blades are completely opened and closed. Therefore, if

disclosed in the patent to Van Duser, No. 2,234,150, dated March 4, 1941, contacts can be caused to be closed at any point from the commencement of the opening of the shutter blades to the full-open position thereof. In using the high speed flash system wherein a condenser is discharged through a gaseous tube. this discharge takes place the instant a control circuit is closed.

My invention as disclosed in the second embodiment thereof, which will now be described, is particularly adapted for controlling said type of flash apparatus wherein a condenser is discharged through a gaseous tube, as contacts can be made to close when the shutter is fully opened, and since the flash is instantaneous, the most efiicient use of the light will be obtained, and said second embodiment is also particularly adapted for flashing a lamp having approximately a five millisecond delay.

Referring now to Figs.v 10, 1l and l2, wherein the said second embodiment of my invention is disclosed, on the lens board 2| is secured a switch base member or plate 88 by means of screws 89, 89 passing through slots 90, 9| therein, thus providing means for adjusting the position of .the switch with respect to the shutter set lever 28, thereby providing means for controlling the point at which contacts are closed during the travel of the shutter set lever 23 in a contraclockwise direction.

The auxiliary switch 55 is made up of two similar castings or housing members 92, 93 in face to face relation which are secured to the, plate 88 by means of screws 94, 94. Clamped between the housing members 92, 93, and fitted in proper channels molded therein, are Contact members 95, 96 which are securely held in place by the castings. At one end of each of the contact members 95, 96 is a channel formation 91, 98 respectively, most clearly shown in dotted lines in Fig. l1 to make contact with plug members 99 of contacting plug |00. To the opposite ends of contact members 95, 95 are attached contacts |0|, 02 respectively.

Also mounted on the auxiliary switch housing members 92, 93 by means of pin |03 is a rocker member |04 caused to be turned in a clockwise direction by the said shutter set lever 23 when the shutter is released for operation to make an exposure. When the shutter set lever 23 reaches the rocker member |04, the latter is caused to turn in a clockwise direction, thus closing the contacts |02, thereby completing a circuit as follows-through contact member 95, plug member 99, Wire |05, lamp base |06, lamp contact |08, wire |09, battery ||0, wire to contact 99 of plug member |00, plug member 99, through channel formation 98 to contact member 96, contact |02 and contact |0|, thus causing the ignition of lamp |01. If the wires |05 and are connected to a gaseous-discharge type of flash equipment, that equipment will be caused to function in timed relation to the shutter.

It is possible to use this embodiment of my invention without using the magnetic tripper by operating the shutter release lever 24 manually, which would result in the movement of the shutter set lever 23. In such case the wires 5|, 52, shown in Figs. 1, 2 and 3, would be connected to the series outlet of the battery case, and wire 30 and plug 29, shown in Fig. 1, would not be used. Practically all battery cases for use with photoflash synchronizers are provided with a series outlet. Such series outlet provides an external circuit in series with the battery and photoflash lamp, and upon closing such external circuit, a circuit will be completed through the battery and the flashlamp, thus causing the ash lamp to be ignited. If it is desiredto operate a gaseous-discharge type of dash equipment, such as just referred to, it is not necessary to provide a battery circuit. Wires |05 and are connected to the trigger circuit of the i'lash equipment and the shutter is operated manually by the shutter release lever 24, and this will cause a gaseous clischarge to take place when the shutter set lever 23 reaches the full open condition.

My invention as herein disclosed provides simple means for converting a standard photoflash synchronizer designed for flash lamps having twenty milliseconds delay to a synchronizer for flashing lamps having a delay in the neighborhood of flve milleseconds and also for operating a gaseous tube discharge lamp. The equipment is very simple, easy to adjust and can be installed by any ordinary mechanic. Such synchronizer devices as have been heretofore worked out for flashing the SM type of lamp or for flashing a lamp having a short-time delay have all required a separate battery case and the equipment was not interchangeable, so as to be quickly adapted for use of either type of bulb.

My synchronizing equipment as herein disclosed can be readily installed and left in place, and the operator can select the type of synchronization he desires to use by merely changing reflectors and making the proper electrical connection.

The unit or assembly shown in Fig. 2 is as an entirety` an article of separate manufacture and sale, which may be applied by the purchaser to or inserted in the structure shown in my said Patent 2,329,011. It may also be a part of the equipment shown in the said application.

Having thus described two illustrative embodiments of the invention, it is to be understood that although specific terms are employed, they are used in a generic and descriptive sense and not for purposes of limitation, the scope of the invention' being set forth in the following claims.

I claim:

1. As a new artice of manufacture and sale, a unit readily insertable as an assembly in a basic synchronizer equipment for cameras, said equipment having a central contact member 45, without making timing adjustment of said basic synchronizer and without making alteration thereof excepting. for removal of its own photoflash bulb, socket and reflector, and the insertion of such unit, the following connected parts: a socket for a photoflash bulb of very short ignition-delay; a reflector particularly adapted to such very short ignition-delay bulb and connected to the socket thereof; means for detachably attaching said connected reflector and socket to the battery case of the basic synchronizer equipment Without change in timing adjustment; circuiting means including two conductor wirings 5|, 52 insulated from each other by insulation 49, including a conducting part 50 to which said conductor wiring 52 is connected and which conducting part is 'directly receivable on the said central contact member 45 of the basic synchronizer equipment and including a metal rod 48 engaging the contact of said very short ignition-delay bulb and to which the conductor wirings 5| is electrically connected, said insulation 49 being between said rod 46 and said conductor wiring 5|; and an auxiliary switch constituting delay means and electrically connected to said conductor wiring 5|, 52 and having a movable part for operatively connecting it to the operated part of the electromagnetic -operator of the basic synchronizer equipment and having means for attachment to the camera in close proximity to the said electromagnetic operator and to the shutter.

2. An article of manfacture in accordance with I claim 1, but wherein said auxiliary switch includes a housing with means for readily `attaching it as a part of said unit directly to the lens board of the camera in proximity to a between-the-lens shutter also carried by said lens board.

3. An article of manufacture in accordance with claim 1, but wherein there is provided an insulating plug 35 in the socket of said very short ignition-delay bulb and through which plug the said rod 46 extends to engage the contact of said very short ignition-delay bulb.

4. An article of manufacture in accordance with claim 1, but wherein said circuiting means includes a metal cup 50 receivable upon the centrai contact member 45 of the equipment, and wherein the insulation 49 comprises an insulating cup in said metal cup 50, and wherein there is provided a metal sleeve 48 in said insulating cup 43, the said metal vrod 46 being molmted in said metal sleeve 48 and in electrical engagement with A the very short ignition-delay bulb, and wherein the conductor wiring 5l extends from said metal sleeve 4l to the said auxiliary switch, and wherein the conductor wiring 52 extends from said metal cup 50 to said auxiliary switch. f

5. An article of manufacture in accordance with claim 1, but wherein said auxiliary switch'includes a lever 62 connected to the movable member of the electromagnetic operator and includes con-l tacts 82, 83 that are closed by movement of said lever 62, and which contacts 82, 83 are respectively connected to said conductor wirings 6. An article of manufacture in accordance with claim 1, but wherein the said unit includes a switch plate 65 attachable to the lens board o! the camera and carrying a stud 63, and includes a lever 62 pivoted upon said stud, the said lever 62 having a formation to engage the stem `of the magnetic operator and also includes contacts adapted to be closed by movement of said lever 62, and which contacts are connected respectively to said conductor wirings 5|, 52.

7. In combination, a. photoash, basic, synchronizer equipment for cameras, and a cooperating Aunit readily inserted as an entirety in the said equipment for the purpose ,of employing in said basic synchronizer equipment a bulb of very short ignition-delay without making timing adjustment of said equipment, said basic synchronizer equipment having among other parts means upon which can be inserted a dash bulb of longer ignition delay than that of said inserted unit, and an electromagnetic operator in an electric circuit of the equipment and connected to a shutter of the camera, the said inserted unit including the following parts, namely: a socket for a photoiiash bulb of very short ignition-delay; a reector particularly adapted to such very short ignition-delay bulb and connected .to the socket-thereof;

means for detachably attaching said connected reiiector and socket to the basic synchronizer equipment without change in timing adjustment; circuiting means including two conductor wirings 5I, 52 insulated from each other by insulation 49 and including a conducting part to which said conductor wiring 52 is connected and which conducting part is directly receivable on the said central contact member 45 of the basic synchronizer equipment and including a metal rod 46 engaging the contact of said very short ignition-delay bulb and to which the conductor wiring 5I is electrically connected, said insulation 49 being between said rod 46 and said conductor wiring 5I; and an auxiliary switch constituting delay means and electrically connected to said conductor wirings 5l, 52 and having a movable part for operatively connecting it to the operated part of the electromagnetic operator of the basic synchro,- nizer equipment and having'means for attachment to the camera in close proximity to the said electromagnetic operator and to the shutter.

8. A combination in accordance with claim 7, but wherein the said auxiliary switch includes a housing with means for securing it directly to the lens board of the camera in proximity to the shutter of the camera, and which shutter is oi the between-the-lenstype and is also carried by such lens board. i

OSCAR STEINER. 

